Improvement in car-springs



L Patented May 18,1875.

W. P. HANSELL.

Gar-Springs.

THE GRAPHIC IIO.PMOTO-LITH.39&41 PARK PLACE,N Y

wrruzssss UNITED STATEs PATENT QFFIGE.

WALTER P. HANSELL, 0F PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN CAR-SPRINGS.

Specification forming part of Letters Patent No. 163,485 dated May 18,1875; application filed January 25, 1875.

To all whom it may concern:

Be it known that I, WALTER P. HANSELL, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in (Jar-Springs; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to which it pertains to make and usethe same, reference being had to the accompanying drawing, and to theletters of reference marked thereon, which form a part of thisspecification.

The features which distinguish this spring from others consist of aspiral spring, produced from a bar of metal or steel having a greaterwidth at its ends than in the center, and greater thickness in themiddle than at the ends, the object being to obtain a broad bearing ateach end of the spring, with comparatively narrow and thick coils asthey approach the center, or at the center, giving the spring thegreatest strength at this point in thickness, while the ends arecomparatively thin, so that the bar may be coiled on its edge upon amandrel having the same diameter its full length, and produce by thepeculiar shape of the bar a center opening of equal diameter from end toend, with the outer edges of the coils increasing in diameter from thecenter to the ends, and form thereby a double conical contour, givingthe spring great strength and elasticity.

In the accompanying drawings, Figure 1 represents an elevation of acar-spring embracing my invention; Fig. 2, a vertical sectionof thesame; Fig. 3, a side view of the bar from which the spring is formed,and Fig. 4 an edge view of the same.

The bar A to form the spring is brought to the proper shape, either byflattening the ends a, or cutting the metal with wide flat ends and anarrow thick middle, b, or by taking a wide 'bar and drawing it downinthe center;

or in any way that will produce the required shaped bar that will give,when coiled, the broad flat bearing ends B and narrow thick middle coilsO. The ends of the bar are thinner than the center, where it increasesin thickness and in strength; an essential difference between 'mypresent spring and that patented to me December 15, 1874,

being that the double cone in said patent is formed from a bar of thesame width and thickness throughout its length, upona mandrel of twocones joined at their apexes, while in the present case the bar tapersin width on the flat side from the extreme ends, as shown in Fig. 3,toward the center, and in thickness from the center or middle to itsends, as shown in Fig. 4c, and is coiled upon a mandrel of the samediameter throughout its length, as shown in Fig. 2, and produces, whenso coiled, a spiral spring having the outline only of a double cone, asshown in Fig. 1.

The bar is coiled on its edge, and as it is wider at its ends than themiddle, it thus produces an outer double outline, as described.

The ends may be flattened or cut out as far toward the center of the baras desired, and such flattened ends may be long enough to make one coil,or they may be long enough to make the spring taper down to the center.

Any suitable dimensions for the bar may be used, and the spring may beused with or without the usual plates at the top and bottom.

Helical springs have been made from a bar varying in width, or on itsflat side, from the middle to either end, and a car-spring made fromsuch form of bar is not claimed in this patent.

I claim- 1. A spiral spring made from a bar having a uniform fiatwiseand edgewise taper from the ends to the middle, and from the middle tothe ends, substantially as and for the purpose set forth.

2. A spiral carspring, coiled from a bar tapering edgewise from themiddle to the ends, to give the greatest strength to the middle coils ofthe spring, as set' forth.

3. A spiral car-spring having broad, thin, flat end coils, thick centercoils, a cylindrical central opening, and adouble conical contour,substantially as set forth.

In testimony that I claim the foregoing as my own, 1 have affixed mysignature in presence of two witnesses WALTER P. HANSELL.

Witnesses:

WM. J. LOGAN, BIDDLE R. HANsELL.

